Highest temperature in Hong Kong on May 27?

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Market context

On 27 May 2026, the Hong Kong Observatory will record the day's highest temperature in Celsius. This market resolves to whichever temperature band contains that official reading, drawn from the Observatory's "Absolute Daily Max" metric published in their Daily Extract dataset. Settlement occurs at 12:00 UTC on that date, though resolution cannot finalise until the Observatory has completed and published its daily climate record—typically within 24–48 hours of observation.

Hong Kong's late May temperatures cluster reliably between 28–32°C based on thirty-year normals, with absolute maxima occasionally reaching 34–35°C during pre-monsoon heat spikes. The 0% crowd probability suggests either a technical issue with market configuration or that traders are awaiting historical comparison data before committing capital. Reviewing the Observatory's historical daily extracts for May dates across recent years provides the empirical baseline: 2023 saw 31.2°C on 27 May; 2024 recorded 30.5°C. These precedents anchor expectations within the 30–33°C range for typical conditions.

Traders automating position entry should monitor the Observatory's forecast updates released daily at 09:00 HKT, particularly their "very hot weather" warnings (issued when forecasts exceed 33°C). The onset of the southwest monsoon typically occurs in mid-to-late May, which can suppress afternoon peaks through increased cloud cover and moisture. Programmatic feeds should track both the official forecast and any issued heat advisories in the week prior, as these correlate with actual temperature outcomes and provide leading signals for range selection.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Bot UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Bot UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.